Hello and welcome to Bleepingcomputer.
Please go to this link and download MalwareBytes by clicking the FREE version of it, install MalwareBytes and update it by going to the UPDATE tab.
Once it has updated please run the program with a fullscan and let it finish.
MalwareBytes will create a log, save it to your desktop. If it finds any infections please allow it to remove what it finds.
If it fails to run, run it in safe mode, by rebooting and pressing the F8 key when you see the windows splash screen.
If your computer is infected, your post will be refered to someone in our malware removal team.
Please post back your results.
Mawarebytes Anti malware http://www.malwarebytes.org/